I got one last year for winter SAR call-outs and love it. Hydration hose runs through the strap to prevent freezing, shovel pocket keeps probe, blade and handle away from my spine and other gear, it's large enough for skins, harness/self rescue, grub, bivy, first aid arsenal, repair kit and spare clothing. I also like the goggle pocket on top. Perfect 24 hour setup for me. Only gripes - I wish it had a dedicated helmet strap and the zipper pull cords are falling off but that's easy to repair. Oh, and it does a great job of packing my skis!